Representation dependence of the neutron-proton kinetic energy in adiabatic deuteron stripping
Abstract
Deuteron stripping reactions such as (d,p) are a main tool for studying the single-particle structure of nuclei, and they are usually analyzed with the adiabatic distorted-wave approximation (ADWA). With nonlocal nucleon optical potentials, ADWA cross sections change by tens of percent, up to a factor of two, depending on which realistic neutron-proton interaction describes the deuteron. Continuum-discretized calculations change much less, and exact Faddeev calculations reduce the spread by about a factor of ten. Should this sensitivity be read as a probe of neutron-proton physics at short distances? One identified route for it in ADWA is a single number, the neutron-proton kinetic energy averaged over the region where the two nucleons interact. I change the AV18 interaction only at short distances, keeping neutron-proton scattering, the deuteron binding energy, and the long-range tail of the deuteron unchanged. This number then rises from 218 to 314 MeV, more than half of its spread among five realistic interactions, while the coefficient that sets the low-momentum shape of the form factor moves by only one percent of its realistic range. The number therefore reflects how the interaction is written, not anything measured. It enters ADWA through two features that the other calculations treat differently: ADWA weights the deuteron where the two nucleons are close, and it assigns the deuteron energy to the pair however fast the two nucleons move. For this short-range change, an average that keeps the full Gaussian shape of the nonlocal potential, instead of expanding it to lowest order, rises by only 6 MeV against 96 MeV.
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BibTeX
@misc{lei2026representation,
title = {{Representation dependence of the neutron-proton kinetic energy in adiabatic deuteron stripping}},
author = {Jin Lei},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.16472},
eprint = {2610.16472},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.16472},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Representation dependence of the neutron-proton kinetic energy in adiabatic deuteron stripping
AU - Jin Lei
PY - 2026
DA - 2026/10/15
PB - arXiv
DO - 10.48550/arxiv.2610.16472
UR - https://arxiv.org/abs/2610.16472
AB - Deuteron stripping reactions such as (d,p) are a main tool for studying the single-particle structure of nuclei, and they are usually analyzed with the adiabatic distorted-wave approximation (ADWA). With nonlocal nucleon optical potentials, ADWA cross sections change by tens of percent, up to a factor of two, depending on which realistic neutron-proton interaction describes the deuteron. Continuum-discretized calculations change much less, and exact Faddeev calculations reduce the spread by about a factor of ten. Should this sensitivity be read as a probe of neutron-proton physics at short distances? One identified route for it in ADWA is a single number, the neutron-proton kinetic energy averaged over the region where the two nucleons interact. I change the AV18 interaction only at short distances, keeping neutron-proton scattering, the deuteron binding energy, and the long-range tail of the deuteron unchanged. This number then rises from 218 to 314 MeV, more than half of its spread among five realistic interactions, while the coefficient that sets the low-momentum shape of the form factor moves by only one percent of its realistic range. The number therefore reflects how the interaction is written, not anything measured. It enters ADWA through two features that the other calculations treat differently: ADWA weights the deuteron where the two nucleons are close, and it assigns the deuteron energy to the pair however fast the two nucleons move. For this short-range change, an average that keeps the full Gaussian shape of the nonlocal potential, instead of expanding it to lowest order, rises by only 6 MeV against 96 MeV.
ER -